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Method of Stress Field and Stability Analysis of Bedding Rock Slope Considering Excavation Unloading

  • Geotechnical Engineering
  • Published:
KSCE Journal of Civil Engineering Aims and scope

Abstract

The stress state of a slope and its analytical solution are prerequisites for stability analysis. Currently, the limit equilibrium method cannot consider the stress state of slopes, and the solution of bedding slope stress remains in numerical simulations for a long time. In this paper, based on the theory of the elastic stress solution of the wedge top under a concentrated load, the analytical solution of the stress field was obtained using Matlab programming. Unloading stress analysis method (USAM) for determining the sliding surface of the bedding rock slope, safety factor (Fs), and reinforcement forces (Fr) were proposed. The USAM is compared with the Limit Equilibrium Method (LEM) and Finite Element Method (FEM) in terms of the Fs, Fr, sliding surface position, and sliding surface stress. The results show: 1) The analytical stress of the slope can be obtained quickly and conveniently using the USAM, while subsequent programming helps in faster completion of the stability evaluation of the bedding rock slope. Fs, Fr, sliding surface position, and sliding surface stress are all close to the results obtained by the FEM. 2) The USAM is more suitable for analyzing slopes when the angle between the slope surface and structural plane is greater than 20° (θ > 20°) and the slope angle is greater than 45° (β > 45°). 3) Through the analysis of specific engineering cases, the safety factor calculated by USAM are 0.06 and 0.02 larger than those obtained by LEM and FEM, respectively, and the required reinforcement force for the slope is closer to that obtained by FEM. The novel stress and stability analysis method allows for the rapid evaluation and optimal engineering design of bedding rock slope.

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Acknowledgments

This research was financially supported by the Science and Technology Innovation and Demonstration Project of Yunnan Provincial Department of Transportation: [2020] No.74, [2020] No.98, and the Ministry of Science and Technology Demonstration Project of Transport (2017-09).

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Authors and Affiliations

  1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, China

    Hui Qin, Xiaotao Yin, Hua Tang & Xu Cheng

  2. University of Chinese Academy of Sciences, Beijing, 100049, China

    Hui Qin, Xiaotao Yin, Hua Tang & Xu Cheng

  3. School of Urban Construction, Yangtze University, Jingzhou Hubei, 434023, China

    Hao Yuan

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  1. Hui Qin
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  2. Xiaotao Yin
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  3. Hua Tang
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  4. Xu Cheng
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  5. Hao Yuan
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Correspondence to Xiaotao Yin.

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Qin, H., Yin, X., Tang, H. et al. Method of Stress Field and Stability Analysis of Bedding Rock Slope Considering Excavation Unloading. KSCE J Civ Eng 27, 4205–4214 (2023). https://doi.org/10.1007/s12205-023-0035-y

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  • DOI: https://doi.org/10.1007/s12205-023-0035-y

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